Brown planthopper threat to rice production in asia in may 1977 a symposium was held at the international rice research institute in the philippines to discuss the results of research on nilaparvata lugens stal on rice and to develop plans for its control. Brown planthopper threat to rice production in asia abstract in may 1977 a symposium was held at the international rice research institute in the philippines to discuss the results of research on nilaparvata lugens stal on rice and to develop plans for its control. Brown planthopper bph nilaparvata lugens is a phloem feeding insect which is one of the most serious threats to rice crops in many countries throughout asia 1h nmr spectroscopy combined with. The brown planthopper nilaparvata lugens homoptera fam delphacidae has become a serious threat to rice oryza sativa production throughout asia the increase in severity of the insect appears to be associated with the technology used in modern rice culture